OR ASPEX. 



369 



wood it burns brightly, but rapidly, giving out 

 but little heat. 



As an ingredient in the la.ndscape, the Aspen 

 presents the most pleasing appearance in situa- 

 tions where the playful change of its foliage is 

 thrown out by a dark background. 



In Belgium it is said to be particularly liable 

 to the attacks of the larvse of many insects, which 

 are collected by order of the authorities and 

 destroyed. 



A chemical principle, called popidine, has been 

 extracted from the bark and leaves of the Aspen, 

 w^hich has a sweet taste like that of liquorice, and 

 crystallizes in the form of delicate white needles. 

 Its properties are but little known. 



